## Search found 51 matches

Fri Mar 16, 2018 6:38 pm
Topic: nucleophile and electrophile reactions
Replies: 6
Views: 1529

### Re: nucleophile and electrophile reactions

do we need to know nucleophiles and electrophiles for the final? What is the difference between them?
Fri Mar 16, 2018 6:37 pm
Forum: *Electrophiles
Topic: what is going to be on the final? [ENDORSED]
Replies: 12
Views: 1227

### Re: what is going to be on the final?[ENDORSED]

does anyone know if ochem will be huge on the final
Fri Mar 16, 2018 6:36 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: porous disk
Replies: 3
Views: 222

### Re: porous disk

how do you know when to use a porous disk?
Sat Mar 10, 2018 3:55 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pseudo Rate Law [ENDORSED]
Replies: 3
Views: 278

### Re: Pseudo Rate Law[ENDORSED]

Are there any homework problems where we use the pseudo rate law?
Sat Mar 10, 2018 3:50 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation [ENDORSED]
Replies: 7
Views: 400

### Re: Arrhenius Equation[ENDORSED]

how would you find A (frequency factor) in the Arrhenius Equation?
Sat Mar 10, 2018 3:39 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: formula on 15.61
Replies: 3
Views: 240

### Re: formula on 15.61

or you can make y2 = ln(k) and y1 = ln(k') as the book did it.
but you should get the same answer either way
Sat Mar 10, 2018 3:37 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: formula on 15.61
Replies: 3
Views: 240

### Re: formula on 15.61

I used point slope form. If ln(k) = -(Ea/R)(1/T) + ln(A), where y = ln(k), m = -(Ea/R) , x = (1/T), and b = ln(A)

point slope form is (y2-y1) = m(x2-x1)
You can substitute (lnk' - lnk) = -(Ea/R)(1/T' - 1/T)
and then distribute the negative to get:
(lnk' - lnk) = (Ea/R)(1/T - 1/T')
Sat Mar 03, 2018 10:10 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics vs Thermodynamics
Replies: 7
Views: 464

### Re: Kinetics vs Thermodynamics

If a reaction is thermodynamically stable, will it automatically be kinetically stable?
Sat Mar 03, 2018 10:07 pm
Forum: Zero Order Reactions
Topic: Zero order common?? [ENDORSED]
Replies: 5
Views: 323

### Re: Zero order common??[ENDORSED]

is it possible to have a pseudo 0 order reaction
Sat Mar 03, 2018 10:06 pm
Forum: First Order Reactions
Topic: Pseudo-First Order Reaction [ENDORSED]
Replies: 4
Views: 287

### Re: Pseudo-First Order Reaction[ENDORSED]

what is the difference between k' and k?
Sun Feb 25, 2018 4:54 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Instantaneous Rate
Replies: 4
Views: 367

### Re: Instantaneous Rate

Why are we only looking at initial rate of reaction in this chem class?
Sun Feb 25, 2018 4:47 pm
Forum: First Order Reactions
Topic: Reaction order
Replies: 4
Views: 294

### Re: Reaction order

is it possible to find reaction order for more than two products or reactants?
Sun Feb 25, 2018 4:39 pm
Forum: General Rate Laws
Topic: Reaction Rate and Spontaneity
Replies: 5
Views: 670

### Re: Reaction Rate and Spontaneity

can a nonspontaneous and spontaneous reaction have the same reaction rate?
Sun Feb 18, 2018 11:54 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: notation for galvanic cell
Replies: 2
Views: 155

### Re: notation for galvanic cell

is there a notation for concentration cells?
Sun Feb 18, 2018 11:47 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic vs Concentration
Replies: 3
Views: 222

### Re: Galvanic vs Concentration

can someone give me an example of concentration cell? Also, are the calculations basically the same equations for the two cells?
Sun Feb 18, 2018 11:44 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Conductor
Replies: 3
Views: 145

### Re: Inert Conductor

So is platinum one of the common inert conductors?
Sun Feb 11, 2018 12:51 am
Forum: Balancing Redox Reactions
Topic: Salt Bridges
Replies: 14
Views: 515

### Re: Salt Bridges

does a porous disk and salt bridge have the same purpose?
Sun Feb 11, 2018 12:49 am
Forum: Balancing Redox Reactions
Topic: Oxidation vs. reduction
Replies: 8
Views: 322

### Re: Oxidation vs. reduction

How can you tell which reaction to flip when doing the redox problems?
Sun Feb 11, 2018 12:44 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Standard Cell Potential
Replies: 4
Views: 558

### Re: Standard Cell Potential

I am confused as to the difference between cell potential and reduction potential. Can someone explain it to me? Thanks
Sun Feb 04, 2018 1:32 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Reversible and Irreversible Pathways
Replies: 4
Views: 244

### Re: Reversible and Irreversible Pathways

So in that case, is an irreversible pathway not at equilibrium?
Sun Feb 04, 2018 1:30 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: deltaG at equilibrium
Replies: 5
Views: 190

### Re: deltaG at equilibrium

How will you know using the Gibbs Free energy which way the reaction will proceed if its not at equilibrium?
Sun Feb 04, 2018 1:27 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy -/+
Replies: 4
Views: 226

### Re: Gibbs Free Energy -/+

so spontaneous reaction is associated with - Gibbs Free Energy?
Sat Jan 27, 2018 10:05 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible Vs Irreversible
Replies: 3
Views: 190

### Re: Reversible Vs Irreversible

So then why is temperature not constant in irreversible reactions?
Sat Jan 27, 2018 9:59 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible isothermal expansion
Replies: 4
Views: 178

### Re: Reversible isothermal expansion

So will reversible expansion always be at constant temperature?
Sat Jan 27, 2018 9:58 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Degeneracy
Replies: 4
Views: 276

### Re: Degeneracy

Does degeneracy have any relation to the spontaneity of a reaction?
Fri Jan 19, 2018 6:03 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Difference between heat(q), internal energy(U), and enthalpy(H)
Replies: 4
Views: 2405

### Re: Difference between heat(q), internal energy(U), and enthalpy(H)

So then, what is the difference between heat (q) and enthalpy (H)? more specifically the difference between q and deltaH
Fri Jan 19, 2018 5:59 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: the sign of q and w [ENDORSED]
Replies: 6
Views: 329

### Re: the sign of q and w[ENDORSED]

so if w decreases, will the internal energy of the system increase or decrease?
Fri Jan 19, 2018 5:56 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: W=-(Pex)(deltaV)
Replies: 5
Views: 511

### Re: W=-(Pex)(deltaV)

Wait, so is the work in perspective of the system?
Fri Jan 12, 2018 12:13 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.51
Replies: 3
Views: 169

### Re: 8.51

so when finding the enthalpy of reaction, is it just the sum of enthalpy of formation of products - sum of enthalpy of formation of reactants?
Fri Jan 12, 2018 12:10 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.49
Replies: 5
Views: 238

### Re: 8.49

What is the difference between internal energy and enthalpy?
Thu Jan 11, 2018 12:22 am
Forum: Phase Changes & Related Calculations
Topic: Enthalpy is a state property
Replies: 13
Views: 730

### Re: Enthalpy is a state property

So would Heat be considered a state property or not?
Tue Dec 05, 2017 10:27 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Oxoacids
Replies: 1
Views: 192

### Oxoacids

I am very confused on what an oxoacid is. Can someone explain what it is and its significance? Thank you
Tue Dec 05, 2017 10:25 am
Forum: Conjugate Acids & Bases
Topic: Different from Bronsted and Conjugate
Replies: 3
Views: 356

### Re: Different from Bronsted and Conjugate

Is there a difference between Conjugate Bronsted acid/base and Conjugate Lewis acid/base?
Sun Dec 03, 2017 11:54 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted and Lewis acid definitions?
Replies: 3
Views: 338

### Re: Bronsted and Lewis acid definitions?

Are lewis acids and bases the same as bronsted? Or are they different types of acids and bases?
Sun Dec 03, 2017 11:52 pm
Forum: Amphoteric Compounds
Topic: Amphiprotic [ENDORSED]
Replies: 5
Views: 619

### Re: Amphiprotic[ENDORSED]

What is the difference between amphiprotic and amphoteric
Sat Nov 25, 2017 9:43 pm
Forum: Ideal Gases
Topic: Ideal Gas Law
Replies: 3
Views: 215

### Re: Ideal Gas Law

What if one of the two assumptions are not met?
Sat Nov 25, 2017 9:41 pm
Forum: Ideal Gases
Topic: Partial pressure when calculating K
Replies: 4
Views: 462

### Re: Partial pressure when calculating K

When do you use partial pressure versus concentration when finding equilibrium?
Sun Nov 19, 2017 9:16 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Understanding sigma and pi bonds?
Replies: 8
Views: 430

### Re: Understanding sigma and pi bonds?

Do sigma and pi bonds apply to ligands and coordination compounds?
Sun Nov 19, 2017 9:14 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Complexes
Replies: 5
Views: 311

### Re: Chelating Complexes

I'm still confused as to the definition or function of a chelate is versus a regular ligand. What is the distinction between the two?
Sat Nov 11, 2017 12:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles [ENDORSED]
Replies: 3
Views: 243

### Re: Bond Angles[ENDORSED]

how do we know the bond angles for trigonal bipyramidal? Do we need to memorize all the different angles?
Sat Nov 11, 2017 12:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape Memorization [ENDORSED]
Replies: 7
Views: 928

### Re: Shape Memorization[ENDORSED]

What is the difference between trigonal planar and trigonal bipyramidal?
Mon Nov 06, 2017 12:46 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity [ENDORSED]
Replies: 6
Views: 684

### Re: Electron Affinity[ENDORSED]

What is the difference between electron affinity and electronegativity?
Mon Nov 06, 2017 12:44 am
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 10
Views: 586

### Re: Lewis Structures

Is the center atom when creating a lewis structure the least electronegative atom or the atom with lowest ionization energy?
Sat Oct 28, 2017 1:15 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Difference between subshell and orbital [ENDORSED]
Replies: 9
Views: 1577

### Re: Difference between subshell and orbital[ENDORSED]

Can someone tell me the difference between a wave function and orbitals?
Sat Oct 28, 2017 1:08 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: electron spin quantum number (ms) [ENDORSED]
Replies: 4
Views: 550

### Re: electron spin quantum number (ms)[ENDORSED]

How do you know if an electron will be spin up of spin down?
Fri Oct 20, 2017 11:03 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electrostatic potential energy [ENDORSED]
Replies: 2
Views: 190

### Re: Electrostatic potential energy[ENDORSED]

Yes the charges relate to the charges of the electrons of the atom
Fri Oct 20, 2017 11:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: s-,p-, d-, and f- orbitals
Replies: 7
Views: 497

### Re: s-,p-, d-, and f- orbitals

I am confused. When is the d orbital less energy than the next s orbital? and when is d orbital greater energy?
Fri Oct 13, 2017 1:54 am
Forum: Properties of Light
Topic: Question 1.9
Replies: 3
Views: 279

### Re: Question 1.9

Yes, the wavelength of a microwave is indeed 1mm.
Thu Oct 12, 2017 11:19 pm
Forum: Properties of Light
Topic: Balmer Vs. Lyman
Replies: 12
Views: 1548

### Re: Balmer Vs. Lyman

I am confused as to what n1 and n2 represent. What exactly does it symbolize?
Thu Oct 05, 2017 8:00 pm
Forum: SI Units, Unit Conversions
Topic: Formula Units
Replies: 7
Views: 461

### Re: Formula Units

So does formula units only apply to ionic compounds?
Thu Oct 05, 2017 7:52 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs [ENDORSED]
Replies: 16
Views: 2227

### Re: Sig Figs[ENDORSED]

How many sig figs is in 0.053?